Global Patent Index - EP 0229183 B1

EP 0229183 B1 19910925 - WIRE CUT ELECTRIC SPARK MACHINE

Title (en)

WIRE CUT ELECTRIC SPARK MACHINE

Publication

EP 0229183 B1 19910925 (EN)

Application

EP 86903590 A 19860611

Priority

JP 12913785 A 19850615

Abstract (en)

[origin: WO8607294A1] A wire cut electric spark machine provided with a tapering control unit improved so that a tapering process can be carried out with a high accuracy even when the rigidity of a wire electrode varies due to the variations in the temperature thereof which occur when a working current varies. The information representing the relation between a working current and a tapering angle in the whole control range of a taper angle to be controlled is prepared in advance. A means for setting a working current, and a means for inputting a current program so that the working current varies with the lapse of time, or a means for detecting the working current are provided. The above information is read in response to the working current set, and program-inputted so that the current varies with the lapse of time, or detected. Computation is carried out on the basis of this information, if necessary, to determine a correction value with respect to the tapering angle. The tapering angle is corrected by using this correction value, and a tapering process is then carried out by using the corrected tapering angle.

IPC 1-7

B23H 7/04; B23H 7/06

IPC 8 full level

B23H 7/02 (2006.01); B23H 7/04 (2006.01); B23H 7/06 (2006.01)

CPC (source: EP KR US)

B23H 7/04 (2013.01 - KR); B23H 7/065 (2013.01 - EP US)

Designated contracting state (EPC)

CH DE FR GB LI

DOCDB simple family (publication)

WO 8607294 A1 19861218; DE 3681716 D1 19911031; EP 0229183 A1 19870722; EP 0229183 A4 19881024; EP 0229183 B1 19910925; JP H0364254 B2 19911004; JP S61288929 A 19861219; KR 870700433 A 19871229; US 4801779 A 19890131

DOCDB simple family (application)

JP 8600289 W 19860611; DE 3681716 T 19860611; EP 86903590 A 19860611; JP 12913785 A 19850615; KR 870700127 A 19870213; US 3084987 A 19870312